Process for increasing the affinity of animal fibers for dyestuffs



Patented Jan. 8, 1929.

UNITED STATES 1,698,226 PATENT OFFICE.

EDMOND DU BOIS, OF EASEL, SWITZERLAND, ASSIGNOR TC CHEMICAL WORKS FORMERLY SANDOZ, 0F BASEL, SWITZERLAND.

i PROCESS FOR INCREASING THE AFFINITY'OF ANIMAL FIBERS FOR DYESTUFFS.

No Drawing. Application filed December 23, 1925, Serial No. 77,397, and in Germany January 6, 1925.

The present invention relatesto a process for the treatment of animal fibers and has for its object to subject same to an operation which has the effect of increasing their alfinity for .dyestufi's of any kind, except the basic ones. This refers not only to dyestuffs, which, without such a treatment do not possess anyaflinity, but also to those, which commonly are absorbed by the animal fiber, whereby in the latter case, an important increase of the aifinity is obtained.

The process consists in a suitable treatment of the fibers with esterifying agents, whereby this treatment can be efiected in any working state of the fiber.

To perform the process, the following esterifyin agents ma enter into consideration: halides of alip atic, aromatic and alicyclic carboxylic andsulphonic acids, as well as aromatic anhydrides. Such a treatment has the effect of considerably increasing the aflinity of acid dyestuffs.

The following examples illustrate the 1mproved process.

Ewample 1.

increasedafiinity compared to the untreated ones, they can further be dyed to a large extent with direct cotton dyestufis, whereby it is possible to dye in a neutral bath without any addition. The dye-bath is exhausted in a much shorter time than by untreated wool.

Example 2.

g. of wool are worked for two hours very thoroughly within a suspension of g. of para-toluol-sulphone chloride, finely pulverized, and 20 g. of chalk in 250 g. of Water at 7 5 C. and afterwards subjected to the after treatment as indicated in Example 1. The tinctorial properties of the fiber thus obtained are identical to thoseoi' Example 1.

Example 3. 20 g. of wool are-treated, as indicated in Example 1 with 250 g. of a 20% solution of benzoylchloride in toluene, then washed in the weak soap solutions as stated, subsequently rlnsed and dried. a

The increase of affinity for all acid dyestufi's in a neutral bath is very distinct, also (1128a; cotton dyestufls dye the fiber to a large ex en Example 4.

20 g. of wool are treated with 250 g. of a 20% solution of acetylchloride in toluene, as indicated in Example 1, and then after treated 1n the same manner as above. The fiber thus obtained shows the tinctorial properties as stated in Example 1.

Example 5.

Example 6.

20 g. of wool are worked thoroughly for two hours within 250 of a 20% solution, of ben zoic acid anhydri e in toluene and then SllbJBCtBd to the after treatment as indicated in Example 1. The tinctorial properties of the fibers thus obtained are identical to those of Example 1.

Example 7.

20 g. of wool-are treated according to the animal fibers for dyestufls, consisting in 5. A process for increasing the afiinity of treating the animal fibers with halides of animal fibers for d estuffs, consisting in 10 aromatic sulphonic acids as esterifying treating the animal hers with para-toluolagents. sulphone chloride as esterifying agent and 4. A process for increasing the affinity of then washing same with Weak soap solutions. animal fibers for d estufis, consisting in In witness whereof I have hereunto signed treating the animal fibers with chlorides of my name this 7th day of December, 1925. aromatic sulpho acids, EDMOND DU BOIS. 

